Objective-c,iOS应用开发随笔

• 如何编程方式给 UITextView 焦点

[UITextView becomeFirstResponder ] ;

• 如何将iOS的文本框默认的copy、past改成中文复制粘贴

info.plist中将Localization native development region改为China,并增加Localized resources can be mixed，设为YES，

ps：此方法也可以将导航栏中的返回按钮由“back”变为“返回”

• NSString 分隔符生成数组NSArray

NSArray * lineArray = [lineAll componentsSeparatedByString:@"|"];

• 如何获得指定日期是星期几

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDate *now2;
    NSDateComponents *comps = [[NSDateComponents alloc] init];
    NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | 
    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    now2=[NSDate date];
    comps = [calendar components:unitFlags fromDate:now2];
    int week = [comps weekday];    
    int month = [comps month];
    int day = [comps day];
    int hour = [comps hour];
    int min = [comps minute];
    int sec = [comps second];

• 百度地图，显示当前用户所在位置，并居中

CLLocationCoordinate2D coordinate=userLocation.location.coordinate;
  BMKCoordinateRegion region = BMKCoordinateRegionMake(coordinate, BMKCoordinateSpanMake(0.5, 0.5));

 [_mapView setRegion:region animated:NO];

• development签名报错“Provisioning profile xxx specifies the Application Identifier XXX  which doesn't match the current setting XXX ”

  Check with your keychain listings.. There might be duplicate profiles as you have already installed new one over older one. In cas you found duplicate profiles, remove older one and remove your "DerivedData" (in case of xcode 4.3/ xcode 4.5) or "Build" folder and then set profile settings for your target and try to rebuild.

ps：记得重启xcode